Antistatic aerial



R. A. WEAGANT I Aug. 23,1927. 1,639,913

'ANTISTATIC AERIAL Filed Oct. 6, 1920 TORNEY 1 I a. VENTOZJ Patented as. 23,1927.

UNITED STATES.

PATENT OFFICE.-

BOY A. WEAGANT, 0] NEW YORK, N. Y., ASSIGNOB TO RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE.

iut'rrsrarxc mam.

Application fled October 6, 1820; same Io. 415,081.

This invention relates to radio signaling,-

but more especially to an anti-static aerial or antenna, particularly useful for radio reception in that it receives signals but minimizes the efi'ectsof static disturbances through properties inherent in .the antenna structure itself.

In my copending application Serial #415,082, I have referred to the difierent properties of dilferent t pes of aerials in respect to their modes of rawing energy from signal and static impulses, and I have disclosed my discoveries in regard to the properties of .a type of aerial, which I have called an. intermediate type, because it seems to have properties intermediate between the recognized types of a closed loop or an open vertical antenna, and fpossesses some of the properties of each 0 these types.

This intermediate type of aerial is exemplified in an open loop, which may have one or more turns or convolutions, or it may be a horizontally extending linear ascillator, or a horizontal antenna grounded at one end, directly or by counterpoise, and tuned by utilizing tuning'means in the earth connection. Such an intermediate type of antenna, I have found, receives signal waves after the manner of a closed loop, but receives static impulses after the manner of an open vertical antenna, and by combining antennae or antenna portions of one of the recognized types with this intermediate type, static may be minimized, due to difierences in the phases of the signal and static currents produced in the said antenna portions.

. My present invention is based on my discoveries in regard to the properties of antennae of different types, and I have found that an aerial may be constructed, comprising two associated portions together forming a single antenna and acting as a single antenna with respect to the receiving circuits, one portion of the structure however being of a recognized type, as a vertical antenna, and the other being of the intermediate type referred to, as for instance, an open lo p.

As an illustration of myinvention, I have.

taken a vertical antenna portion and an open loop portion, and in associating these portions, the vertical antenna is referably connected to substantially the mid point of the open loop and preferably grounded, either directly or b counterpoise. The receiving circuits for t e station are operatively reing circuits to both the vertical and open 5" loop portion. In fact, I find it more desirable in most cases not to do so, but prefer to associate the receiving circuits with only the vertical antenna portion; Why this should be so, I am at present unable to ex- 05 plain, but my experience has shown that due to some inherent properties in the two associate'd antenna portions of the different types referred to, signals can be satisfactorily read through heavy static, in cases in which they 1:0

could not be read with either antenna portion alone constituting the aerial.

In the drawings 1 have illustrated preferred forms of the inventions in which:

Fig. 1 is a diagrammatic representation of an antenna structure embodying the invention; and v Fig. 2 is a view of a modification. Referring to the drawings, A represents one antenna portion of recognized type, '80

shown in this instance as a vertical antenna, grounded at B, and provided with the usual tuning devices in the form of a loading coil C and. condenser D.

The signaling circuits, shown in this inas stance as receiving circuits E, are preferably suitably coupled to the vertical antenna portion A by means of the coupling coils F and G and the circuits include as shown, a detector H and telephones J.

Theother antenna portion of intermediate type is shown in this instance as an open loop K, preferably having a plurality of turns, but it may have only a single turn or as many as desired. The loop portion is preferably in a vertical plane ing in the directionof the transmitting station it is desired to receive. The vertical antenna portion A is preferably adjustably connected to substantially the mid point- L of the open Y loop portion K, and the portion K may or may not be provided with tunin elements, as desired, but is preferably tune Fig. 2 is similar to Fig. 1, except that the antenna portion A is shown grounded 165 through a counterpoise B instead of directly as in Fig. 1, and a small condenser O is shown inserted between the ends of the antenna portion K, for at times such a small capacity at this point is found to be advantagcous, dependin u on conditions of reception and Wave. length. With a small condenser inserted in this manner the antenna portion acts as an open loop and as far as the present invention is concerned will be referred to as an open loop.

In both the examples of Figs. land 2, the

antenna structure as a whole, formed by the portions A and K. is preferably tuned to the Wave length of the signal to be received. and under these circumstances, I have found that the effects of static disturbances are greatly minimized, and to such a marked degree that satisfactory reception can be had under substantially the most diflicult conditions. The energy gathering capability of the two portions preferably is of the same order of magnitude. In any case the size of the loop and number of turns or both are adjusted until the best efiect-is attained.

If the loop is of sufficient vertical height a low vertical antenna may be used, as the vertical component of the loop then supplies an effective vertical antenna. Obviously other structures equivalent to those illustrated by me may be devised by those skilled in the art Without departing from the spirit of my invention, as set forth in my claims forming a part of this specification.

I claim and desire to obtain by Letters Patent the following:

1. An aerial for radio signaling, comprising an open loop portion having a plurality of turns and a vertical antenna porition connected to substantially the mid pointof the open loop portion.

2. An aerial for radio signaling, comprising two associated collecting portions together forming a single antenna. one of said port-ions being an open loop having a plurality of turns, and the other being a grounded vertical antenna portion connected to the mid-portion of said open loop portion.

3. An aerial for radio signaling, comprising two associated collecting portions together forming a single antenna, one of said portions being an open loop having a plurality of turns and the other being a vertical antenna portion connected to the mid-portion of said loop portion and signaling circuits associated with one of said antenna portions;

4. An aerial for radio signaling, comprising two associated collecting portions together forming a single antenna, one of said portions being an open loop having a plurality of turns and the other being a vertical antenna portion connected to substantially the mid point of the open loop portion, and signaling circuits operatively connected to said vertical antenna portion.

5. An aerial for radio signaling, comprising two associated collecting portions together forming a single antenna. one of said portions being an open loop having a plurality of turns, and the other being a grounded vertical antenna portion connected to substantially the. mid point of said open loop portion, and signaling circuits coupled to said vertical antenna portion.

ROY A. WEAGANT. 

